Solder the 5x2 pin header on the WRAP board. Modify power circuit as needed.
Connect the adapter using the flat cable.
Enter S during memory test to get into BIOS setup, enable USB there
(old BIOS versions don't have this option, and will require upgrade).

The 5V linear regulator (78L05) on the WRAP board is limited to 100 mA, and
is very inefficient at higher input voltages. Should be ok for low power
flash keys or self-powered hubs / peripherals.
Otherwise modifications wil be needed. Either connect your own 5V supply
to the WRUSB adapter, or modify the WRAP board for 5V operation: